There are around 3500 billionaires in the world. With family those rooms will quickly fill up.

The people supervising the help need some rooms.

Epstein 2.0 would at least double occupancy on their own.

Maybe they have human shields on one end of the island and the billionaire reservation on the other. Also, note that Kushner, like Trump, is always lying. We'll only know what is actually built after it is done.